Might have been a NAT problem on ATT's WAP gateway.

(Rambling...) My rule of thumb is that if you can live comfortable at $1000x/year, then you should bill $x/hour. That is, if you want your salary to be $50,000/year, bill at $50/hour.

Keep in mind that you have lots of overhead (tools, telecom, electricity, insurance, training, travel), and lots of nonbillable time (vacation, sick, training, travel). A good target is to bill for 45 weeks/year.